3RA2811-1CW10

Description

Overview

The Siemens 3RA2811-1CW10 is a high-performance electronic timing relay designed for seamless integration with SIRIUS motor starter components. This device operates with an ON-delay function, making it ideal for processes requiring a defined delay before a task starts. Its compact design allows it to be snapped directly onto the front of 3RT201 and 3RT202 contactors, as well as 3RH2 auxiliary contactors, saving valuable panel space and simplifying wiring.

Key Features & Technical Specifications

• Function: ON-delay timing (Delayed make).
• Time Range: Highly flexible, adjustable from 0.05 to 100 seconds.
• Operating Voltage: Wide range compatibility with 24-240 V AC/DC, 50/60 Hz.
• Output: Reliable semiconductor output.
• Coil Attenuation: Includes an integrated varistor for the attenuation of contactor coils, protecting surrounding components and increasing system reliability.
• Connection: Secure and familiar screw terminals.
• Mounting: Direct front-snap-on mounting for contactors 3RT201, 3RT202, and 3RH2.

Benefit

• Space & Cost Saving: The direct-mounting capability eliminates the need for a separate DIN rail-mounted timing relay, reducing enclosure space requirements and installation time.
• Enhanced System Protection: The integrated varistor minimizes voltage spikes when switching off contactor coils, extending the lifespan of the contactor and the overall control system.
• Global Versatility: The wide voltage range (24-240 V AC/DC) allows for application across various global power standards without needing multiple relay variants.
• Reliable Performance: The robust semiconductor output ensures consistent, long-lasting switching performance in industrial environments.

Application / Function

The 3RA2811-1CW10 timing relay is a crucial component for automation systems requiring precisely timed sequence control. It is typically used in applications such as:

• Start-up of Star-Delta (Wye-Delta) Motor Combinations
• Delayed start of fans, pumps, or conveyors
• Sequencing of machinery operations
• Time-dependent interlocking controls

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